Drilling and tapping attachment.



No. a5o,|90. Patented myV 22, |960.

T .|.-PETRE|.L|.

DBILLING AND TAPPING ATTACHMENT.

- (Application led Nov. 28, 189B.)

(No Model.)

UNITED STATES i,

PATENT AGENCE;l

JOSEPH PETRELLI, OE NEW HAVEN, CONNECTICUT.

DRILLING AND TAPPING` ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 650,190, dated May 22, 1900.

Application led November 28, 1898. Serial No. 697,592. (No model.)

To all whom, t may concern:

Be it known that I, JOSEPH PETRELLI, of New Haven, in the county of New Haven and State of Connecticut, have invented a new Improvement in Drilling and Tapping Attachments, and I do hereby declare the following, when taken in connection with the accolnpanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in-

Figure 1,a perspective View of one form which a drilling and tapping attachment constructed in accordance with my invention may assume; Fig. 2, a view thereof in vertical section, showing the parts in their reversing or idle positions; Fig. 3, a corresponding view showing the parts in their driving positions; Fig. 4, a detached View of the coupling spindle together with its coupling pin and drill-chuck; Fig. 5, a detached sectional `view of the chambered head as it appears Vwhen stripped.

My invention relates to an improved drilling and tapping attachment for use in conjunction with drill-presses oi'kindi'edV machines and of the class providing for reversing the drill itselfwithout stopping or reversing the machine, the object being to produce a simple and compact attachment designed with particular reference to simplicity of construction and to the protection of its running parts.

With these ends inviewmy invention con! sists in an attachment having certain details of construction and combinations of parts,

as will be hereinafter described, and pointed,

out in the claim.

In carrying out my invention I employ a spindle A,Which is designed to be coupled in any approved manner with the verticallymovable and rotative spindle of the drillpress or other kindred machine with which my improvement may be used. The lower end of the said Vspindle A is journaled in a bushing B, which isentered into a vertical pinion-receiving opening C, formed in the top of a case D and secured in place by means of a transversely-arranged pin B'. The said case is formed from a single block or piece of metal and contains a relativelylarge centrally arranged pinion -receiving chamber D', and its general form may be said to be cylindrical, although, as shown, its

hereinafter speak of as the driving-pinion. 6o

The collar E of this pinion engages with the lower face of theibushing l? before mentioned, whereby the case D is virtually suspended from the spindle A, which thus becoines a suspension spindle, by which 'term I shall hereinafter designate it.

The said driving-pinion E, which is thus'located inthe upper portion of the pinion-receiving chamber D, meshesinto a correspondingpbut vertically-arranged pinion F, located within 7o the chamber D in a vertical position, and which I shall hereinafter speak of as the intermediate pinion. The said intermediate pinion is provided with a short stud F', which turns in a horizontallyarranged stud-hole H2,

Vformed in the case and leading out of one of the side walls of the chamber D' from the bottom of a recess H', formed in the said wall for the reception of a hub F2, formed upon the intermediate pinion F and constituting a bear- 8o The said intermediate pinion ing therefor. F meshes into a horizontally-arranged reversing-pinion G, located in the lower portion of the chamber D' ata point directly below the driving-pinion before mentioned,

lthe hub G, of this pinion resting upon the bottom of a recess G2, leading out of the lower end of the pinion-receiving chamberD. It will thus be seen that all of the pinions are located entirely within the said pinion-receiv- 9o ing chamber D'. These three pinions are constantlyin mesh, and it will be understood, of course, that on account of the use of the intermediate pinion F the driving-pinion E and the reversing-pinion G will always turn in opposite directions. The said driving-pinion E is provided with a notched coupling-hub e, While the said reversing-pinion Gis provided with a corresponding notched coupling-hub g, the notches of these hubs coacting with a roo coupling-pin I, transversely mounted in a longitudinally movable coupling spindle I', which at its lower end carries a chuck J of any approved construction, the said chuck receiving the drin or tap K. 'rhespinaie 1'-r` passes upward through an openingI2 in the lower end of the case and through the pinions G and E'and enters an axial socket A',-formed ,for its receptionin the lower end of the sus-Y pension-spindle'A, which isprovided with `an abutment-collar A2, which is set to engage with the upper or outer face of the bushing B. The notched hubs e g of the pinions E and G are sufficiently separated from each other to permit the coupling-pin I to turn between them, andthecoupling-spindle -I' is permitted a sufficient rangeof verticallon gitudinal movement to permit the coupling-pin Itocoactwith the hub of either pinion.

It wil-l beunderstood from the foregoing description that when the 'drill K strikes the object'to 'be drilled the coupling-spindle will be lifted so as to impinge the coupling-pin I against the hub e of the driving-pinion E. Then as thesaid pinion is rotated the pin willv soo'nnd'its seat in the notches of the said hujb e-of the' pinion. The coupling-spindle having thus been coupled with the drivingp inionythedrill will be rotated in the directionofA the-arrow d, shown by Fig. 3, which -represents-the driving position of the parts.

- Thisposition ofthe parts will be maintained afslo'ngas any upward pressure is placed upon I thedrilhwhich will be as long as the same.

is doingthe work of drilling. Just as soon,

, however, as the attachment is lifted by lifting'the rotary and longitudinally-movable spindle of the press in theusual manner the ciently lengthened by the insertionvof a rod into it, for which purpose it ismade hollow.

Itis obvious that in carrying out my invention some changes from the constructionV herein shown and described may be made, and I would therefore have it understood that I do not limit myself tothe kexact construction shown, but hold myself at liberty to make such alterations as fairly fall within the spirit and scope of myinvention. I am aware, however, that it is old in devices of the class to which my device belongs to employ a case, a beveleddriving-pinion, a beveled intermediate pinion, a beveled reversing-pinion, all located within the said case and constantly in mesh with each other, a spindle connected with the driving-pinion, and alongitudinallymovable coupling-spindle depending below the-case and extending upward through the reversing and driving pinions and adapted to be coupled with one or the other of them, according to its vertical position. I do not, therefore, claim sucha construction broadly. Having fully described my invention, what I claim as new, and desire to secure'byLetters Patent, isv In adrilling and tappingy attachment, the combination with'a case containing a pinionreceiving chamber and a vertical pinion-receiving ropening,'and. a lateral pinion-receiving opening intersecting the said chamber and. providing for the introduction ofv pinions thereinto, of a beveled driving-pinion, a

. .sistingof ,ajplug Land a hollow handle-L',

theplugLgitting'into the outer end of atrans-l versepinion-receiving opening H, formed inv the side of the case at a point opposite thel piniondEwhich'may be introduced i-nto and. removedfrom the chamber D through -the -said opening,` whichis made large enough for weight of jthe-drill K and chuck J `and couplitigi-spindle I4 will cause the same to descend A bygravitwhereby the coupling-pin I willV `bedisengaged from the hub e of the drivingpinion 'E and` engaged with the hub gof the reversing-pinion J. As soon as this enga-ge' ment takes place the drillwill begin to' rot-ate .inltheopposite direction, as shown byjthe arrow b in Fig..2, although the suspension-spinfdle .A`4 has neither been stopped nor reversed.

Foi-preventing the case D from. rotatingl employ a` hollow radially-arranged stop conthat purpose, though, if preferred, all of the pinions may fbe entered into and removed fiioln'the said chamberthrough the pinion- "re'ceiyingopening C, which is made large 'Y enoughnfor the purpose.

If the .handle Lf'is nqtlong enough to engage with some part of the .frame ofjthe Ddrill-press, it,ma'y be sufreversing-pinlon, alllocated in the said cnamber and constantly in mesh with eachother,

a suspension-spindle entering the said' cham.-

ber through the said vertical pinion-receivingopening, and having the said driving-.pin-

ion mounted upon'it, a bushing located in. thesaid opening. which itnorrnallycloses and forminga bearing for the saidspindle, allongitudinally-movable coupling-spindle entering' the said chamber through the lower end of the case, extending upward through the.

said reversing and drivin gpinions and adapted to be coupled withr one or the Vother of them according to its vertical position, and a stop comprising la pluganda handle, the plug being inserted into the said transverse pinionreceiving opening which it normallycloses, and the handle formi'nga stop for the attachment. l

In testimony whereof I have signed this specification in the presence of two subscribingv witnesses. j

JOSEPH PETRELLI. Witnesses:

FRED. C. EARLE, GEORGEA D. SEYMOUR. 

